| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
,3
* Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, Quebec, Canada J1M 1Z3
Department of Plant and Animal Sciences, Nova Scotia Agricultural College, Truro, Nova Scotia, Canada B2N 5E3
Département des Sciences Animales, Université Laval, Quebec, Quebec, Canada G1K 7P4
2 Corresponding author: benchaarc{at}agr.gc.ca
Four ruminally cannulated, lactating Holstein cows were used in a 4 x 4 Latin square design (28-d periods) with a 2 x 2 factorial arrangement of treatments to study the effects of dietary addition of essential oils (0 vs. 2 g/d; EO) and monensin (0 vs. 350 mg/d; MO) on digestion, ruminal fermentation characteristics, milk production, and milk composition. Intake of dry matter averaged 22.7 kg/d and was not significantly affected by dietary additives. Apparent digestibilities of dry matter, organic matter, neutral detergent fiber, and starch were similar among treatments. Apparent digestibility of acid detergent fiber was increased when diets were supplemented with EO (48.9 vs. 46.0%). Apparent digestibility of crude protein was higher for cows fed MO compared with those fed no MO (65.0 vs. 63.6%). Nitrogen retention was not changed by additive treatments and averaged 27.1 g/d across treatments. Ruminal pH was increased with the addition of EO (6.50 vs. 6.39). Ruminal ammonia nitrogen (NH3-N) concentration was lower with MO-supplemented diets compared with diets without MO (12.7 vs. 14.3 mg/100 mL). No effect of EO and MO was observed on total volatile fatty acid concentrations and molar proportions of individual volatile fatty acids. Protozoa counts were not affected by EO and MO addition. Production of milk and 4% fat-corrected milk was similar among treatments (33.6 and 33.4 kg/d, respectively). Milk fat content was lower for cows fed MO than for cows fed diets without MO (3.8 vs. 4.1%). The reduced milk fat concentration in cows fed MO was associated with a higher level of trans-10 18:1, a potent inhibitor of milk fat synthesis. Milk urea nitrogen concentration was increased by MO supplementation, but this effect was not apparent when MO was fed in combination with EO (interaction EO x MO). Results from this study suggest that feeding EO (2 g/d) and MO (350 mg/d) to lactating dairy cows had limited effects on digestion, ruminal fermentation characteristics, milk production, and milk composition.
Key Words: essential oil • monensin • metabolism • dairy cow
This article has been cited by other articles:
|
|
 |
|
  J. Chiquette, M. J. Allison, and M. A. Rasmussen Prevotella bryantii 25A Used as a Probiotic in Early-Lactation Dairy Cows: Effect on Ruminal Fermentation Characteristics, Milk Production, and Milk Composition J Dairy Sci, September 1, 2008; 91(9): 3536 - 3543. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. L. Firkins, B. S. Oldick, J. Pantoja, C. Reveneau, L. E. Gilligan, and L. Carver Efficacy of Liquid Feeds Varying in Concentration and Composition of Fat, Nonprotein Nitrogen, and Nonfiber Carbohydrates for Lactating Dairy Cows J Dairy Sci, May 1, 2008; 91(5): 1969 - 1984. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
W. Z. Yang, C. Benchaar, B. N. Ametaj, A. V. Chaves, M. L. He, and T. A. McAllister Effects of Garlic and Juniper Berry Essential Oils on Ruminal Fermentation and on the Site and Extent of Digestion in Lactating Cows J Dairy Sci, December 1, 2007; 90(12): 5671 - 5681. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
R. Martineau, C. Benchaar, H. V. Petit, H. Lapierre, D. R. Ouellet, D. Pellerin, and R. Berthiaume Effects of Lasalocid or Monensin Supplementation on Digestion, Ruminal Fermentation, Blood Metabolites, and Milk Production of Lactating Dairy Cows J Dairy Sci, December 1, 2007; 90(12): 5714 - 5725. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
N. E. Odongo, M. M. Or-Rashid, R. Bagg, G. Vessie, P. Dick, E. Kebreab, J. France, and B. W. McBride Long-Term Effects of Feeding Monensin on Milk Fatty Acid Composition in Lactating Dairy Cows J Dairy Sci, November 1, 2007; 90(11): 5126 - 5133. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. Calsamiglia, M. Busquet, P. W. Cardozo, L. Castillejos, and A. Ferret Invited Review: Essential Oils as Modifiers of Rumen Microbial Fermentation J Dairy Sci, June 1, 2007; 90(6): 2580 - 2595. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
D. C. da Silva, G. T. Santos, A. F. Branco, J. C. Damasceno, R. Kazama, M. Matsushita, J. A. Horst, W. B. R. dos Santos, and H. V. Petit Production Performance and Milk Composition of Dairy Cows Fed Whole or Ground Flaxseed With or Without Monensin J Dairy Sci, June 1, 2007; 90(6): 2928 - 2936. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
G. R. Fraser, A. V. Chaves, Y. Wang, T. A. McAllister, K. A. Beauchemin, and C. Benchaar Assessment of the Effects of Cinnamon Leaf Oil on Rumen Microbial Fermentation Using Two Continuous Culture Systems J Dairy Sci, May 1, 2007; 90(5): 2315 - 2328. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
N. E. Odongo, R. Bagg, G. Vessie, P. Dick, M. M. Or-Rashid, S. E. Hook, J. T. Gray, E. Kebreab, J. France, and B. W. McBride Long-Term Effects of Feeding Monensin on Methane Production in Lactating Dairy Cows J Dairy Sci, April 1, 2007; 90(4): 1781 - 1788. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. Benchaar, H. V. Petit, R. Berthiaume, D. R. Ouellet, J. Chiquette, and P. Y. Chouinard Effects of Essential Oils on Digestion, Ruminal Fermentation, Rumen Microbial Populations, Milk Production, and Milk Composition in Dairy Cows Fed Alfalfa Silage or Corn Silage J Dairy Sci, February 1, 2007; 90(2): 886 - 897. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
